F. Børgesen: Rhodophyceæ of the Danish W. Indies. 



67 



given short diagnoses of some new species, which has only added 

 to the difficulties. Having now examined my West Indian ma- 

 terial of this genus I have found that good characters are pre- 

 sent not only in the shape of the assimilating filaments but also 

 in that of the carpogonial branch, of the antheridia and the cysto^ 

 carps. In the last mentioned, especially, the filaments surrounding 

 the sporogenous filaments are very differently developed. In the 

 specimens which are not easily recognizable by means of the 

 external habit, e. g. rami- 

 fication, calcification etc., 

 these characters of internal 

 structure might be of great 

 assistance. 



Judging from the de- 

 scription of Butters ^) Lia- 

 gora reminds one much of 

 Trichogloea, the essential 

 difference is that the carpo- 

 gonial branch is lateral in 

 Liagora, and terminal in 

 Trichogloea. 



1. Liagora elongata Zanard. 



Zanardini, G., in Flora, 

 vol. 34, 1851, p. 35; Plant, in 

 Mari Rubro . . . (Memoria Isti- 

 tuto Veneto, vol. VII, 1857, p. 

 274, tab. 6, fig. 1). Kützing, 

 F., Tabulæ Phycol., vol. VIII, 

 18,58, pi. 94 II. Agardh, J., 

 Epicrisis, p. 516; AnalectaAlgo- 

 logica, Contin. Ill, p. 105. 



Fig. 67. Liagora elongata Zanard. Part of 

 a plant. (About 3:1). 



As pointed out by J. Agardh (1. c. p. 105) this species is 

 characterized by the fact that the cells in the robust assimilating 

 filaments (Figs. 68, 69 a) have nearly the same breadth through 

 their whole length and further that the cells are seldom longer 

 than double their diameter. The assimilating filaments are not 

 much ramified ; the branches arise mostly at an acute angle from 

 the mother filaments and are all straight or nearly so. 



*) Butters, Fr. K., Observations on Trichogloea lubrica. (Minnesota Bo- 

 tanical Studies, Third Series, Part I, 1903, p. 11). 



5* 



